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ICD-10 mild cognitive disorder: epidemiological evidence on its validity
H Christensen1, A S Henderson, A F Jorm
1National Health and Medical Research Council, Australian National University, Canberra.
Psychological Medicine
|January 1, 1995
Summary
The ICD-10 diagnosis for Mild Cognitive Disorder (MCD) may not be valid, as criteria are inconsistently met and don't correlate with cognitive performance in the elderly. This impacts understanding of cognitive decline.
Area of Science:
- Gerontology
- Neuropsychology
- Psychiatry
Background:
- The International Classification of Diseases, 10th Revision (ICD-10) defines Mild Cognitive Disorder (MCD).
- Assessing the diagnostic validity of MCD in community-dwelling elderly populations is crucial for accurate clinical practice.
Purpose of the Study:
- To evaluate the validity of the ICD-10 diagnostic criteria for Mild Cognitive Disorder (MCD).
- To examine the correlations between different diagnostic criteria and their relationship with cognitive functioning and psychological factors in the elderly.
Main Methods:
- Applied ICD-10 diagnostic criteria for MCD to a sample of 897 elderly participants.
- Analyzed the prevalence of each criterion (A-D) and the overall rate of MCD diagnosis.
- Calculated correlations between diagnostic criteria and assessed cognitive performance, anxiety, depression, and neuroticism.
Main Results:
- Only 4% of participants met all four ICD-10 criteria for MCD.
- Weak correlations were found between diagnostic criteria (A, B, C), suggesting poor convergence.
- MCD diagnosis was predicted by self-reported daily life interference with memory/intelligence, not by objective cognitive tests or physical illness reports.
- Individuals diagnosed with MCD exhibited higher anxiety, depression, and neuroticism but showed no substantial differences in cognitive functioning tests compared to controls.
Conclusions:
- The findings question the construct validity of the ICD-10 diagnosis of Mild Cognitive Disorder.
- The current criteria may not accurately identify a distinct cognitive syndrome in the elderly.
- Further research is needed to refine diagnostic criteria for cognitive impairment in aging populations.